Oust collector



B. Ross.

DUST COLLECTOR.

APPLICATION FILED JAN.23| 1917.

1 ,3 1 6, 924 Patented Sept. 23, 1919.

4'SHEETS-SHEET l.

l @am 1 'IIIIIIIL B. ROSS.

DUST COLLECTOR.

APPLICATION FILED IAN.23\I9H.

1 ,316,924. PatentedSept. 23, 1919.

4 SHEETS-SHEET 2- B. ROSS.

DUST COLLECTOR.

APPLICATION FILED IAN.23. 1911.

-1 ,3 1 6, 924 Patented Sept. 23, 1919.

4 SHEETS-SHEET 3.

B. ROSS.-

4DUST COLLECTOR. AHPLICATION FILED IAN.23. |911.

Patented y. 23, 1919.

4 SH SHEET 4.

UJI

M|li|imm.....

Inde/n BARTON ROSS, OF BUFFALO, NEW YORK.

DUST-COLLECTOR.

Specication of Letters Patent.

' yApplication led January 23, 1917. Serial No. 143,892.

' To all whom it may concern:

Be it known that I, BARTON Ross, a citizen v of the United States,l residing at Buffalo, in

through the meshes of the fabric.

The objects of the invention are to provide a collector of this kind with means of improved construction for removing the dustfrom the tubes without interfering with the continuous operation of the collector; also to so construct the collector that a part of the tubes may be removed from the collector for repairs or other purposes without interfering with the continuous operation of the collector; also to so mount each group or section of tubes in the collector casing as to permit it to be readily removed therefrom; also to provide means of improved construction for removing the dust from the apparatus; also to provide means for removing the dust from the tubes without permitting anypart of the dust to be again taken up by the current of air passing through the apparatus.; also to provide automatic mechanism of improved construction for moving the shaking and dust removing devices from one section of the collector to another; also to improve the construction of apparatus of this kind in other respects hereinafter specified.

In the accompanying drawings:

Figure 1 is a central sectional elevation of a dust collector embodying the invention.

Fig. 2isa fragmentary sectional elevationthereof, on an enlarged scale, on line 2 2 Fig. 1.

Fig. 3 is a fragmentary sectional elevation thereof on line 3 3, Fig. 16, showing the bearing for the shaking device for the tubes.

Fig. 4 is a fragmentary sectional elevation thereof on line 4-4, Fig. 1.

Figs. 5 and 6 are respectively an end elevation and a longitudinal sectional elevatio of the rotary conveyer box.

Fig. 7 is a top plan view of the dust collector, partly broken away. l Fig. 8 is a sectional plan view thereof on line 8-8, Fig. l1. i

Figs. 9 and 10 are fragmentary sectional elevations thereof showing parts of the shaking mechanism in different positions.

Fig. 11 is a fragmentary sectional elevation thereof on an enlarged scale, on line 11-11, Fig. 8. t

Fig. 12 is a fragmentary sectional plan view on line 12-12, Fig. 1l.'

Fig. 13 is a fragmentary sectional plan view thereof on line 13-13,-Fig. 11, on an enlarged scale.

Fig. 14 is a sectional line 14-14, Fig. 1.

Fig. 15 is a detached top plan view of the dubst hopper and a part of the central air tu e. l

Fig. 1G is a fragmentary top plan view of the dust collector showing the operating mechanism for shaking the tubes and for rotating the vertical shaft of the collector.

plan view thereof on Fig. 17 is a fragmentary sectional plan view thereof on line 17-17, Fig. l, showing the closing device for the air discharge opening of a sectional compartment.

Briefly stated, the dust collector shown in the drawings is organized as follows:

The stationary frame of the collector is divided into three compartments, the first compartment receiving the dust laden air, the second compartment containing the fabric tubes or stockings, and the third compartment receiving the purified air. The compartment containing the tubes is subdivided into a plurality o'f sectional compartments, each separated from the others by air tight partitions and each containing a group or section of tubes which may be removed from the apparatus independently of the other tubes .and without interfering with the operation of the dust collector. The means for cleaning or removin the dust from the stockings include a shaking mechanism for shaking one group of stockingsl at a time, means for entirely disconnectingA `Patented Sept. 23, 1919.

led by an annular wall a and forming a section of the apparatus containing the group ofstockings which is belng shaken from the current of air passing through the dust collector, and meansV for receiving the dust from the stockings` and removing the same from the collector. The shaking mechanism, the means for disconnecting a section-of the collector from the current of air passing through the collector, and the means for removing the dust from the col'-V lector are automatically advanced from one group of stockings to the next so that the,

The stationary' frame of the machine in cludes a'lower horizontal partition a and a spider orl partition frame a', forming with an annular wall a2 a chamber A into which the dust laden air, enters, and two upper horizontal walls or partitions a3 (L4 connectan upper chamber A for the purified air. The space between the horizontal partition'frame d" and partition a4 is divided lby means 4of radial walls a into a plurality of sectional compartments A2, each of which contains a group of tubes. The radial .walls a serve to separate the sectional compartments from eachother, and each of the sectional compartments is provided with a segmental outer wall a". which is removably secured to the radial wall as in such a way as to form a substantially air-tight closure for the sectional compartment and so as to be readily removalble when it is desired to obtain acv cessvto a sectional compartment.- Any suitable means may be employed for retaining a23 being shown in the construction illustrated. The annular walls a2 and a5' are also preferably constructed in sections which are removable from the frame of the machine to The dust laden air .enters the collector through an opening `a" in the annular wall a2 and the purified air passes' out of the col- -lectors vthrough a discharge opening am inl the annular wall a5. The dischar e openmg a10 ispreferably connected wit a suitable exhaust device, not shown, so that the a1r is drawn' through the tubesby suction.

,tains'a dust 'collecting device, ,l which, in thel fbsecuringr-member orv plagxmteb7 similar in con?v Any other arrangement of the several compartments withv regard to each other may be emplo ed if desired. v-

.Eac of the sectional compartments conconstruction shown, consists of a group .of

v tubes B `preferably made 0f cloth or other 60 fabric. The tubes ofeach group are secured at their'lower ends' to a securing member orl plate b havin perforations through which the 'ends' of t e tubes extend. The upper ends ofthe tilbesare Secured to an upper per horizontal unfolded and p struction tothe lower board b andthe upper ends of the tubes .are closed by means of a plate b2 secured tothe upper face of the plate b. The lower securing member or plate b is removably held against the upperV face of the 4horizontal partitionframe a by 'means of cleats or Ithe like 'b3 secured to the radial walls a in such a manner that this plate can be easily removed from the segmental compartment by drawing the plate outwardly out of engagement with the.

partition walls a a* and is normally heldl l in its upper position !by means of a spring 67. The d'u'st laden air from the compartment enters into the tubes through segmental openings Abs in the horizontal partition frame a', one of these openings being provided for each compartment.A The air passes through the tubes B leaving the dust in the tubes, and then passes upwardly lthrough holes or openings b9 in 'the plates b and b2 or through the spaces `betweentheA sides' of the plates b and. b2 andthe partition walls a6 to openings 61' in the horizontal 'partition c4.

By means of the arrangement of the groups of tubes described, i a group may easily be removed from the collector by disconnect# ing the upper plates of the group from the spider b4 and then sliding the lower plate .b radiall outof engagement with' the cleats l,

When one of the groups of tubes .has been removed from its compartment,l the operation of lthe other parts of the dust collector is in no way interfered with since the open- The purified air then passes through the A .compartment A out of the dust collector.

ing bs for'the admission ofthe d ust laden air to the tu'bes can be closed by means'ofl a segmental .closin plate C, Figs. 11 Iand 14, which may be p aced'into engagement with the cleats or retaining strips b3 in place of, the lower vsecurin member or plate b of the of tubes. he upper discharge openrOup A I1.15 lng 1 of a sectional or tube compartment y j may be-closed by any suitablemeans, such,

for example, as a closing device or plate C consisting of two or more sections hinged gether so as to permit the plate when folded to be passed between the spider and-the upy 1partition at. and to be then aced'into operative position on supporting cleats or strips c, Figsvlla'ndv v17'. When the plates C C are in position to coverv the openings bs and b1 of a sec- 'tional compartment, then the compartment Y is entirely disconnected from the other com# partments of the collector and the operationy Vol. the othery portions of the collector is in ing into the current of air passing no way interfered with. In place of the closing devices C and C', an additional set or group of tubes may be provided with the dust collector which can be inserted in place of a group of tubes removed from the apparatus. v

When a group of tubes is shaken bymeans of mechanism, hereinafter to be described, for the purpose of removing the dust there- `sfrom,the dust falls downwardly through the opening b5 and means are preferably provided to prevent this dust from again enterthrough the collector and to remove the ust from the apparatus. In the construction shown for this purpose, a movable dust hopper or passage lD is provided which is arranged in the lowerl compartment A of the dust collector andwhich is so constructed as to receive the dust passing from the tubes through the opening bs and to discharge the same at its lower end through a dust discharge port or opening' d in the lower horizontal partition a of the dust collector. The hopper D is preferably provided with downwardly inclined sides and is adapted to be intermittently rotated about the axis of the dust collector by means of a central upright shaft E, suitably journaled in the frame of the dust collector, to place the hopper into operative relation to one or another of thesectional compartments of the dust collector. In the construction shown, the operating shaft E is provided at its lower portion witli radial arms e to which a conical tube e is rigidly connected so as to revolve with the shaft, and the hopper D is. rigidly secured to -the conical tube e. The hopper there fore forms a passage for the dust through the lower compartment A without permitting the dust to be taken up by the air in this compartment. The annular wall a2 is preferably made with a sloping inner wall corresponding with the slope of the outer wall of the hopper. d represents a scraper preferably secured on the hopper D andadapted toscrape dust collected on the partition a into the openings d. Other means for placing the hopper in operative relation to the sectional compartment in which the tubes are being shaken may be provided.

The dust discharge ports d in the horizontal partition a are normally closed by means of valves F secured on rods f pivoted on the partition a' and are held closed by,

means of weights or the like arranged on arms of the rods f. Each ro f is also provided with an arm f2 extending upwardly through openings f3 in the lower partition plate. These arms are adapted to be actuated by means of a finger or projection f vsecured on and rotatable with the shaft.E, in such a manner as to open a valve F when the hopper D is in operative relation thereto. When the projection f* moves out of engagement with the arm f2 the 'weight f returns the valve F to its closed position. Other means for opening the ports or o )eny ings d to permit the dust to discharge trom thereto may be provided.

Suitablesiueans may be provided for receiving the dust when the same has been discharged through the port d. In the construction shown for this purpose a conveyer G is arranged-in a rotatable conveyer holising G secured to the lower end of the shaft E and adapted to be intermittently. rotated with the hopper D into operative relation to the compartment in which the tubes are to be shaken. The conveyer casing shown is mounted below the lower partition A Vand is provided with a discharge opening g arranged centrally with regard to the collector into which the dust received by the conveyer housin is discharged by means of the conveyer The co'nveycr G, in the construction shown, consists of a spiral screw arranged on a shaft g which is journaled at its o posite ends in the conveyer housing. The s iaft g is provided at its inner end with a bevel gear g2 meshing with an annular bevel gear g3 which is driven by means of a beve gear g4. The annular bevel gear y is preferably constructed in two halves, :is shown in Fig. 4, the two halves being secured together by means of bolts g or other suitable means, and ball bearings y are provided between an outwardly extending fiange (17 and the dust discharge spoilt of the collector and the annular bevel gear. Any other suitable means Jr'or driving the conveyer G may be employed it' desired, the arrangement of the annular bevel gear on the dust discharge spout shown in the drawings however serves as a convenient drive for the conveyer and also permits the dust to be effectively removed from the collector.

The outer portion of the conveyer housing is provided with a roller h riding on an annulartrack L secured on the lower partition a. The roller 'h is preferably mounted on a bracket it which is adjustably secured on the casing G' of the conveyer, Figs. 5 and 6, and which is adjustable by means of a bolt and nut h engaging the bracket h2 and a bracket It* secured on the conveyer housing, for adjusting the position of thc conveyer housing with reference to the bottoni partition a. In this manner the friction be tween this plate and the conveyer housing may be varied for preventing the driving gearing for the conveyer from turning the shaft E and for preventing a leakage of dust through the joint between the conveyer housing and the lower partition a.

Means are provided for closing the air discharge opening b1 of a sectional compartment w en the hopper D and the dust conveyei` G' are inv operative relation to the same. For this purpose a valve l is provided in the construction shown which is secured on the central shaft E of the dust collector and rotates With the shaft and with the hopper D and dust conveyer G so that all of these parts cooperatek with the saine sectional compartment at the same time. In order to insure`the` proper 'closing of the valve central shaft E and presses at its outer end against the outer portion of the valve l, an adjusting screw ibeing provided to permit the proper adjustment of the valve with regard to the partition 'at the hopper D therefore isolate any sectional compartment in which the tubes are' being 7 dust therefrom 1s effected 1n the construction shownpby depressing the rod b and operated upon-from the current of air passing lthrough the collector, so that the dust shaken from the tubes falls freely out of the tubes through the hopper without being in any Way interfered With'by the vcurrent of air passing through the collector and Without coming into contact with the current of Means are preferably provided for breaking the suction in the sectional compartment in which the dust is being removed from the tubes. For this purpose a central tube K is provided in the construction shown which is substantially concentric with the shaft E and which' communicates at its lower end with the conical tube e through an opening .la inthe horizontal partition frame a', so

that outside air can pass from below the dust collector into the central tube K. The tube K is provided with an opening or vent Ic for each sectional compartment and a valve k2 is secured to the shaft E and is provided with a single port through which air can pass from Lthe tube K into any one of the sectionalcompartments. The valve is so positioned that the compartment containing the tubes which are being shaken is connect'- ed with the central air tube K to break the suction therein. 4The yvalve shown is located in the lower portion ofthe air tube K but may, if desired, be located in any other portion of the tube, or more than one valve may be provided.'

The rotating of the central shaft E step by step to place the valves I and K, the hopper D and a dust conveyer G into operative relationto one or another of the sectional compartments may be accomplished by any suitable means, the'follovving mechanism being preferably employed A wheel or disk L is'rlgidly secured ontheA shaft E and is provided at its outer portion withv an annular groove or track Z provided w1th teeth Z corresponding in number to the number of sectional compartments land spaced at regular intervals in the groove or A ltrack. The teeth Z are adapted to be engaged by 'means of a hooked end portion Z2 an arm 'Z is preferably secured on the' The valve I and.l

spring arm M is of an arm Z3 which is pivoted'at4 Z4 on a crank -Z5 secured on a ldrive shaft Z6 through "in the groove Z so as to engage with one of the teeth or notches Z during its rearward movement and to turn the Wheel L during its forward movement, to drive the shaft E through a part of a revolution sufficient to move the valves I and K2, the hopper D and the conveyer G from one sectional compartment to another. `Any other means for intermittently moving the shaft E may be employed.

The shaking of the tubes B to remove the then releasing the .same So as to permit the spring 127 to return' the same to its initial position, thus causing the tubes first to loe-- come slack, as shown in Fig. 10, andthen to be suddenly tightened as shownin Fig. 9. To accomplish the shaking of the tubes, a provided for each of the upright rods b". on a part of the frame m and each arm is provided at its end with an upwardly eX- tending tooth m adapted to be engaged by shaker teeth 'm2 .secured on an annular ro- The arms M are secured tary member m3 which is mounted substantially concentrically with the Wheel .or disk L in a bearing ring m4 secured on the frame work m of the apparatus. member 'm3 has a groove m5 similar to the groove Z in the Wheel or disk L and is provided with teeth m6 adapted to be engaged by the hooked end of a reciprocatory arm m" which is journaled at m8 on an arm- 0r extension m9 `of the crank Z5. .The rotary member m3 is adapted to be intermittently The annular moved through'an arc of a circle by the arm m7 1n sucha manner as to move the shaker teeth m2 past the tooth m of the spring arm M to cause the shaking of the tubes as indicated in Figs. 9 and 10. 'In the construction shown the hooked portion of the arm'M moves the member m3 through a comparatively short d-istance, the greater portion of the movement of the rotary member m3 being accomplished by means of a lug n on the Wheel or disk L which engages a corresponding lug or projection n on the rotary member m3 so that the Wheel or disk L moves the rotary member m3 through a part` of a revolution during each actuation of the Wheel or disk L.,v l

The annular rotary member m3 is preferably journaled in ball bearings, formed by grooves or ball races n2 anda3 in the llO bearing ringI m4 and lcorresponding `ball again carried into the veyer B is driven is preferably rotated from the drive shaft Z by means of a sprocket chain o, passing over a sprocket wheel o secured on the drive shaft l and a sprocket wheel'oz secured on the bevel gear g4. Idler sprocket wheels o3 o4 are employed for guiding the sprocket chain.

'The dust collector shown has the advantage that any group or section of tubes can be removed from the collector for inspection or repairs while the collector is in operation and without interfering with the continuous operation thereof. The removal of the dust from the tubes is effected in such a way that the dust is removed from the apparatus so that it does not come into contact with the current of air passin through the same, thereby preventing te dust from being tubes and increasing the efficiency of the dust collector. By shutting off the compartment containing the tubes being shaken from the rest of the collector, the air current does not in any w'ay interfere with' the cleaning'of the tubes so that the eiiciency of the collector is increased by the thorough cleaning of the tubes. The dust hopper D of the collector need not be absolutely air tight since, if the air is drawn through the separator by suction, a leak in the dust hopper `would cause air from 4the exterior of the apparatus to flow through the tubes in a direction opposite to that in which the air flows when the collector is in operation, thus helping to remove the dust from the tubes. The operation of the collector is entirely automatic and requires no attentionl while in operation,

I claim as my invention:

1. In a dust-collector, the combination of a plurality of dust collecting devices, a casin having a plurality of compartments in whic said. dust collecting ,devices are removably arranged, and imperforate plates adapted to b e placed in the ends of sa1d compartments for shutting ofi' any of said compartments from theair currents in the collector so that the removal of a dust collectin' device from a. compartment will notinter ere with the operatlon of other parts of the dust 'collector. 2. In a dust-collector, the combination of a :plurality of dust collecting devices, a casing having a plurality of compartments in which said dust collecting devices are arranged, air inlet and air-outlet passages in each of said compartments, and lmperforate plates adapted to be placed into said inlet and outlet passages of a compartment and4 which vclose the passages of a compartment, whereby the removal of a dust collecting device will not interfere with the operation of other parts of a dust collector.

3. In a dust collector, the combination' of a ,h

`plurality of dust collecting devices, a chamber below said devices through which thel dust laden air is admitted to said devices, a

plurality of openings in the'bottomof said y placed into operative relation 4to the dust collecting device from which the dust is removed, said chute forming a substantially dust-tight passage through said chamber vfrom one of said devices to one of said openings, and means for actuating said closing means to permit dust to be discharged from said chute to said opening when the chute is in operative relation to the opening.

4. In a dust collector, the combination of a pluralit of dust collectin devices, a chamber fbr admitting dust Iaden air to said devices and arranged below said devices, means for removing dust from said devices, a plurality of dust discharge openings in said cham er each of which is arranged in operative relation to one lof said dust collecting devices, a dust chute movable into operative relation to any one of said dust collecting devices and the corresponding opening to form a substantially dust tight ,passage from said device to said opening,

and means for closing said openings when said chute is out of operative relation thereto.

ber for admitting dust la en air to said-devices and arranged below said devices', meansj for removing dust from sald devices, a plurality of dust discharge openings in said chamber each of which is arranged in operative relation to one of said dust collecting devices, a dust chute movable into operative relation to .any one of said dust collecting devices and t e corresponding opening to form a substantially dust tight passage from said device to saidppening, means for closing said openings when sald chute is out of operative relation thereto, and a dust conveyer arranged below said chamber and movable with said chute into operative relation to any of said openings to which said chute is in operative relation, to receive the dust.

. 6. In a dustcollector, the combination of a plurality of dust collecting devices arranged about a common axis, means for removing dust from one of said devices at a4 corresponding opening, and means for closdust, discharge openings in the bottom of ing said openings when said chute is out of operative relation thereto.

7 In a dust collector, the combination of a stationary casing having aplurality of compartments separated from each other by dust-proof partitions, a. dust collecting deviceA in each-of said compartments, a cham- Aber for the 'dust laden air arranged below said compartments and having upper openings connecting with said compartments,

' said chamber, means Jfor removing dust from vsaid` dust collecting device, and a 'passage which ismovable to connect' any of said upper openings with a corresponding opening in the bottom of said chamber to conduct dust from a compartment through said dust discharge openin s.

8. In a dust collector, the combinationoi alstationa'ry casing having a plurality of compartmentsseparated from each other by dust-proof partitions,'a dust collecting device in each 'of said compartments, a chamber for the dust laden air arranged below said compartments and having upper open-4 ings connecting with said compartments,

dust discharge openings inthe bottom of said chamber, means for removing dust from 5 a plurality x charge opening,

said dust collecting device, a passage which is movable adapted to connect any of said upper openings with a corresponding opening in the bottom of said chamber to conduct dust from a compartment through said dust discharge openings, and means below said dust discharge openings for removing the dust from the apparatus.-

9. vIn a'dust collector, the combination of of dus collecting devices, a 'chamber for admitting dust laden air to said devices, means for; shaking said devices to remove the dust therefrom, dust discharge 4openings in said chamber, and a dust pas ysage movable into operative relation tov one -or another ofJ said dust collecting devices to receive dust therefrom and for conducting the dust'through said chamber to a disair entering the-collector.

10. In-a dust collector, the combination of a plurality of stationary dust collecting devices, a chamber for admitting dust laden air to said devices, dust removing means adapted to operate on one of said devices at a.. time, dust discharge openings in the bottom of said chamber, and a dust passage movable from one dust collecting device to another and adapted to receive the dust from the device lwhichvis 'being acted upon by the dust removing means and to lform a Substantially air tight connection between a device-and a dust discharge opening to conductv the dust through said chamber to j :one of saidf openings, andmeans moving saiddust removing means and said passage passage through whereby the dust is kept out of contact with the current of dust laden into` operative relation to any dust collect ing device.y

11. In a dust collector, the combination of a pluralit of stationary dust collecting devices, a; c amber for. admitting' dust laden Aair to said devices, dust removing means from the collector, and means moving said. dust removing means, said passage and said dust receiving means into operative relation to any rdust collecting device.

12. In a dust collector, the combination of a plurality of stationary dust collecting devices, ai chamber for admitting dust laden air to said devices, dust removing means adapted to operate on one of said devices at a time, dust discharge openings in the bottom of said chamber which are' normally closed, a dust passage movable from ,one

dust collecting device to another and adapted to receive the dust from the device which is being` acted uponby the dust removing means and to form a substantially air tight said chamber to one of said openings, means for opening the dust 4receiving opening when said passage is in operative relation thereto, and means for moving said passageginto operative relationto the dust collecting device which is to be acted upon.

13. In a dust collector, the combination of. a plurality of dust collecting devices arranged about a common axis, means for removing dust from one of said devices at Aa' time, a chamber arranged' below saidl devices and from which dust laden air is admitted to said devices, dust discharge openings iii the bottom of said chamber arran ed at intervals about said axis, one of sai ,openin s being provided for' each of said dust ,co lecting devices, a dust chiitel movable about Sald axis into operative relation to any one of said devices and forming a substantially diist tight .passage through said chamber and connecting any one of 'said deioo l vices with its corresponding opening, 'a` dust v I conveyerv movable about said axis with said chute and arranged 'to move into operative rel/ation to the lowdr side of said openings to receive the dust discharges through said chute, `and means for closing said openings when said chute is out of operative relation thereto.

v14:. In a dust collector, the combination of a plurality of clust collecting devices arranged about a common axis, means for removing dust from one of said devices at a time, a chamber arranged below said devices and from which dust laden air is admittedl to said devices, dust discharge openings 1n the bottom of said chamber arranged at intervals about said axis,'one of said openings being provided for each of said dust collecting devices, a chute movable in said chamber about said axis and adapted to form a substantially dust tight passage connecting any of said dust collecting devices with its corresponding opening, and a dust conveyer arranged below said chamber and movable with said chute into operative relation to one or another of said openings to remove the dust discharged through said chute.

15. In a dust collector, the combination of a plurality of dust collecting devices arranged about a common axis, means for removing dust from one of said devices at a time, a dust conveyer including a casing Iadapted to receive the dust removed from said devices, means for moving ysaid conveyer casing about said axis from one of said devices to another, an annular track supporting the outer portion of said conveyer casing, and means for adjusting said conveyer relatively to said track to hold said casing in substantially dust tight relation to said devices.

16. In a dust collector, the combination of acasing, a plurality of dust collecting devices arranged in said casing about a common axis, means for removing dust from one of said devices at a time, a dust conveyer including a casing adapted to receive the dust removed from sa1d Adevices and ar-A ranged below the bottom of said collector casing, means yfor moving the conveyer about said axis from one of said devices to another,

an annular track Ffor supporting the outer end of said conveyer casing, and means' for adjusting said casing relatively to said track to produce a substantially dust proof cony nection between said casing and the bottom of said collector.

, 17. In a'dust collector, the combination of a plurality of dust collecting devices, each of said devices comprising one or more tubes of fabric or the like secured at their lower ing the tubes and for holding them in' their ends to a plate removably held in the dustV collector, a plate to which the upper ends of sa1d tubes are'connected, a devlce for shakoperative positions, removably secured and an-imperforate serted in place' of t said upper plate, being to said shaking device, late which-may be ine plate to'which the Alower ends of said tubes are secured.`

18. In a dust collector, the combination of Y a plurality of dust collectingfdevices, each of said` d'evices comprising one or moretubes of fabric or thelike secured at their upper andv vice.

v a casing having a lower ends to plates removably held in said dust collector, means connected with said upper plate for shakin said tubes, and an impcrforate plate whic is adapted to be yinserted in said dust collector in place of said lower plate, whereby the removal of the device from the dust collector will not interfere with the operation of the collector.

19. In a dust collector, the combination of a plurality of dust collecting devices, each of said devicescomprising one or more tubes' of fabric or the like secured at their upper' lector without interrupting the operation thereof.

20. In a dustcollector, the combination of a plurality of dust collecting devices, each of said devices comprising one or more tubes of fabric, or-the like secured at their lower ends to a plate removably held in the dustI collector, a plate to which the upper ends of said tubes are connected, and a device for shaking the tubes and `for holding them in their operative positions, said ,upper plate being removably secured to said shaking del 21. In a dust collector, the combination of a'casing having a lurality of com artments, adust collecting evice in each oP said compartments, each of said dust. collecting devices comprising one or more tubes of fabric or the like, a plate to which the lower ends of said tubesare connected and which is adapted to be removably secured in the bottom of a compartment, a plate to which the upper ends of said tubes are secured, a shaking device for removingdust from said tubes including parts extending into each compartment and which are adapted to support the tubes, and means for removably securing the upper plate of a dust collecting device to said part of the shaking device.

` 22. In a dust collector, the combination of lurality of compartments, a dustcollecting evice ineach of said compartments, each of sai'd dust collecting de-V vices com rising one or more tubes of fabric or` the ike, means for removably securing the-lower ends ofsaid tubes in the bottom of a compartment, a plate to which the upper ends o@ said tubes are secured', a shakin de. `Y

23. In la dust collector, the combination of acasing. having a plurality of compartments provided with dustproof side walls and having each an air inlet and an air outment when said shaking device is in opera'- let, a dust collecting device in each of said tion. 10 compartments, means for shaking said dust Witness my hand, this 19th day of J anw, eollecting device to remove dust therefrom, ary, V1917.

5 a vent valve in each of said compartments, Y BARTONVROSS.

and means for preventing air fromentering Witnesses: said air inlet, for closing said air outlet and F. E. PRoCHNow,

for opening said vent valve in a compart- A. L, MCGEE. 

